Follow up: instance control in Java without enum [closed]

Answer 1

this code still missing some interesting features of Enum:

• missing "values()" as Iterator over all enum values
• still missing Ranged Iterator
• cannot be used in switch

Example

public final class Day implements Serializable {

    private static final long serialVersionUID = 1L;
    private static Day[] instances = new Day[7];
    public static final Day MONDAY = new Day("Monday");
    public static final Day TUESDAY = new Day("Tuesday");
    public static final Day WEDNESDAY = new Day("Wednesday");
    public static final Day THURSDAY = new Day("Thursday");
    public static final Day FRIDAY = new Day("Friday");
    public static final Day SATURDAY = new Day("Saturday");
    public static final Day SUNDAY = new Day("Sunday");
    private static int nextOrdinal = 0;
    private transient final String name;
    private final int ordinal;

    private Day(String aName) {
        this.name = aName;
        this.ordinal = nextOrdinal++;
        instances[this.ordinal] = this;
    }

    private Object readResolve() throws ObjectStreamException {
        return instances[this.ordinal];
    }

    public String toString() {
        return name;
    }

    public boolean equals(Object obj) {
        return obj instanceof Day && ((Day) obj).ordinal == ordinal;
    }

    public int hashCode() {
        return name.hashCode();
    }

    public static Iterator values() {
        return new Iterator() {

            private int i = 0;

            public boolean hasNext() {
                return i < instances.length;
            }

            public Object next() {
                return instances[i++];
            }

            public void remove() {
                throw new UnsupportedOperationException("Not supported.");
            }
        };
    }

    public static Iterator range(final Day from, final Day to) {
        return new Iterator() {

            private int i = from.ordinal;

            public boolean hasNext() {
                return i <= to.ordinal;
            }

            public Object next() {
                return instances[i++];
            }

            public void remove() {
                throw new UnsupportedOperationException("Not supported.");
            }
        };
    }

    public static void main(String[] args) {
        Iterator week = Day.values();

        while (week.hasNext()) {
            System.out.println(week.next());
        }

        Iterator weekEnd = Day.range(SATURDAY, SUNDAY);

        while (weekEnd.hasNext()) {
            System.out.println(weekEnd.next());
        }
    }
}